Low-temperature magnetization study of U/sub 6/X (X = Mn,Fe,Co,Ni) compounds
Magnetization and susceptibility measurements have been performed on U/sub 6/Fe and U/sub 6/Co at temperatures 4 K< or =T< or =290 K and applied magnetic fields 10/sup -2/ T< or =H< or =5 T. Low-temperature magnetization measurements at H = 10/sup -2/ T were also made on U/sub 6/Mn, U/sub 6/Ni, and U/sub 6/Mn/sub 0.5/Co/sub 0.5/. All of these materials have strongly paramagnetic, weakly-temperature-dependent susceptibilities at T< or =290 K. Low-field magnetization and metallography results provide information concerning the nature of small concentrations of ferromagnetic impurity phases found in all of the samples studied. An analysis of the data with use of paramagnon models implies that all of the U/sub 6/X compounds are strongly-exchange-enhanced paramagnets. Recent Fermi-liquid models are discussed in relation to predictions of p-wave superconductivity, exchange-enhanced paramagnetism, and electron localization in heavy-fermion systems. An empirical correlation is examined between the ratio of the total magnetic susceptibility to the electronic specific heat and the occurrence of either superconductivity or ferromagnetism for a broad class of metallic solids. The correlation suggests that the U/sub 6/X compounds are near the boundary between superconducting and ferromagnetic ground states.
- Research Organization:
- Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506
- OSTI ID:
- 5565552
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 31:11; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTINIDE ALLOYS
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC SPECIFIC HEAT
EXCHANGE INTERACTIONS
INTERACTIONS
INTERMETALLIC COMPOUNDS
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MAGNETIZATION
MANGANESE ALLOYS
NICKEL ALLOYS
PARAMAGNETISM
PHYSICAL PROPERTIES
SPECIFIC HEAT
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
URANIUM ALLOYS
VERY LOW TEMPERATURE